Lever beam of a loading apparatus



Aug. 29, 1961 A. E. SUNDIN 2,998,143

LEVER BEAM OF A LOADING APPARATUS Filed May 27, 1958 2 Sheets-Sheet 1mmvrog Aug. 29, 1961 A. E. SUNDIN 2,998,143

LEVER BEAM OF A LOADING APPARATUS Filed May 27, 1958 2 Sheets-Sheet 22,998,143 LEVER BEAM OF A LOADING APPARATUS Anders Erik Snndin,Hndiksvall, Sweden, assignor to Hydranliska Industri Aktiebolaget,Hudiksvall, Sweden, a corporation of Sweden Filed May 27, 1958, Ser. No.738,188 Claims priority, application Sweden May 28, 1957 3 Claims. (Cl.212-35) The present invention relates to improvements in a loadingapparatus which is especially adapted to be arranged on a lorry andwhich is provided with a lever beam swingable in vertical and horizontaldirections relative to the body of the loading apparatus, the movementin vertical direction at least partially caused by means of an hydraulicdevice comprising a vertical pressure cylinder and a pressure piston.The latter is at its upper end hinged to the lever beam in such a waythat the latter forms a two-armed lever the arms of which havingdifferent lengths a draw rod being hinged to the shorter arm of thelever beam.

The main feature of the invention is that said draw rod verticallypasses through a guiding device on a socket carried at the upper end ofthe vertical pressure cylinder and turnable by means of an hydraulicdevice, said guiding device being provided with a stopper for limitingthe movement upwards of the draw rod together with the lever beam. Theswinging in a horizontal plane of the lever beam is obtained by turningsaid socket, provided with said guiding device, under intermediary ofsaid draw rod. This device involves inter alia the following advantages.The construction of the loading apparatus is simplified as, according tothe invention, it is not necessary to provide the pressure piston,movable in vertical direction, with means directly forcing it toturnabout its own axis. Such a construction is rather complicated. Thedraw rod makes it further possible to raise the lever beam to an extentwhich has not been possible to reach with previously knownconstructions.

The invention will now be elucidated with reference had to theaccompanying drawings. In the drawings:

FIG. 1 is a side elevation of a loading apparatus according to thepresent invention having. its lever beam directed rearwards,

FIG. 2 is a similar side elevation of the upper part of the loadingapparatus showing the lever bearmswung upwards,

FIG. 3 is a partly broken rear view of the loading apparatus showing thelever beam folded,

FIG. 4 shOWS a horizontal section through the apparatus on the line IVIVin 'FIG. 3, and

FIG. 5 shows on an enlarged scale a partly broken side elevation of thesocket having a guide device, involved in the loading apparatus.

On the frame of the chassis of a lorry is close behind its drivingcompartment 1 arranged a box-formed rail 2 which forms a container forthe pressure medium, preferably oil, which hydraulically actuates theloading apparatus. A pressure cyilnder 3, serving as a vertical columnor a body, has its lower end arranged at the rail 2, and at the upperend of the cylinder 3 there is arranged a device 4 for turning the leverbeam 5 of the loading apparatus in a horizontal plane. Said device 4comprises inter alia two horizontal pressure cylinders 6, 7 havingpistons movable in them and a rack-gear (not shown in the drawings)arranged between said movable pistons. The rack-gear cooperates with agear wheel 8 being journalled on the pressure cylinder 3. Said gearwheel 8 is arranged at the lower end of a socket 9 which is journalledon the upper end of the pressure cylinder 3. Said socket 9 is providedwith a box-formed guiding device 10 which from above is passed throughby a draw nited States Patent 0 2,998,143 Patented Aug; 29, 1961 rod 11being at its lower end provided with a hook 12 adapted to cooperate witha stopper 13 which is laterally disposed in the guiding device 10. Thedraw rod 11 is at its upper end hinged to the shorter arm 15 of thelever beam 5 by means of a bolt 14. The draw rod 11 is at its upper endslightly curved and has a T-shaped cross section. The lateral stem 16 ofsaid T passes between the two side walls 17 of the guiding device 10.The longitudinal stem 18 of the draw rod 11 abuts with its freelongitudinal edge against a guiding bolt 19 extending between said walls17. The lateral stem 16 of the draw rod 11 extends with its lower end 20down beyond the hook 12 in such a way that the guiding is renderedeffective also in the upper-most position of the draw rod 11.

A pressure piston 21 is movably arranged in the vertical pressurecylinder 3, and said pressure cylinder 21 is at its upper end hinged tothe lever beam 5 by means of a bolt 22 in such a way that said leverbeam 5 forms a twoarmed lever. The lever beam 5 comprises a part 23situated close to the body of the loading apparatus and a rocker arm 24which is hinged to said part 23 and at its outer end provided with aloading tool (not shown). The joint between the rocker arm 24 and thepart 23 of the lever beam 5 comprises two coaxial pivots 25 laterallysomewhat spaced from each other. A pressure cylinder 27 having apressure piston is swingab'ly carried with one end around a bolt 26 inthe part 23 of the lever beam 5. The piston rod 28 of the pressurepiston in the pressure cylinder 27 is hinged to the rocker arm 24 bymeans of a bolt 29 at a place situated in the vicinity of the pivots 25but underneath the latter, said piston rod 28 passing in the spacebetween said pivots 25 at the swinging up of the rocker arm 24.

The means for controlling the feeding of pressure medium to thedifferent pressure cylinders 3, 6, 7, and 2.7 are shown onlydiagrammatically in the drawings. The hydraulic pump (not shown) ispreferably coupled to the transmission machinery of the lorry. Thepressure:

side of the pump communicates with a control valve 30 the valve'body ofwhich being adjustable to different control positions. The valve 30communicates through a conduit 31 with the outer end of the left handpressure cylinder 6 (FIG. 3) and through a conduit 32-with the outer endof the right hand pressure cylinder 7. The valve 30 communicates furtherthrough a conduit (not shown) with the vertical pressure cylinder 3. Thecontrol valve 30 communicates also with the pressure cylinder 27 on thelever beam 5 by means of a flexible conduit 33.

The lever beam 5 of the loading apparatus is in FIG. 3 shown in itsfolded position, i.e. in its position during transport with the vehicle.When the loading apparatus shall be used, the control valve is adjustedin such a way that oil is pressed into the vertical pressure cylinder 3.The pressure piston 21 is thereby forced upwards and brings along thedraw rod 11. When the hook l2 abuts against the stopper 13, the leverbeam 5 is raised during continued moving upwards of the pressure piston21. The control valve is simultaneously adjusted in such a way thatpressure medium is pressed into the pressure cylinder 27 which resultsin a turning of the rocker arm 24 in clock-wise direction to theposition shown in FIG. 1. At a continued pressing of oil into thepressure cylinder 3, the lever beam 5 is further raised, for instance tothe position shown in FIG. 2. When the lever beam 5 is completely swungup, there is obtained a considerable lifting height. A turning of thelever beam 5 in a horizontal plane can easily be prosecuted due to thehydraulic turning device 4 which causes a turning of the socket 9 withthe guiding device 10 transmitting the motion to the lever beam 5 viathe draw rod 11.

The returning of the lever beam 5 to its initial position is of courseperformed in the opposite direction in relation to what is described inthe aforesaid. As obvious from FIG. 3, the lever beam 5, when folded together and being in its lowered position, requires a rather small space.In operative position the loading apparatus has a considerable servicerange, and it can With its loading tool reach the vicinity of the bodyof the loading apparatus thanks to the rocker arm 24.

The shown and described embodiment is to be regarded only as an example,and different portions of the loading apparatus may be varied in manyways within the scope of the invention. Thus, the performance of thelever beam and the different hydraulic operating means are independentof the invention. The invention also involves a loading apparatus havingan undivided lever beam, i.e. a not foldable lever beam.

What I claim is:

1. A loading device for a lorry and comprising a lever beam swingablevertically and horizontally with respect to the lorry, and having longand short arms and a fulcrum portion intermediate the outer ends of thebeam; an hydraulic device for at least partially moving the beam, saiddevice including a vertical pressure cylinder mounted substantially fastwith respect to the lorry; a piston in the cylinder and provided with anupwardly extending rod having an upper end portion; hinge means forconnecting the upper end portion of the rod to the fulcrum portion ofthe beam; an off-set socket member mounted on the upper end of thecylinder for turning about the axis of the cylinder; a generallyvertical draw rod slidably passing through the socket member and havingthe upper end thereof pivotally mounted on the outer end of said shortarm; guide means in the socket memher for guiding the rod through thesocket member, and means on the draw rod and socket member for limitingupward movement of the draw rod through the socket member.

2. A loading device for a lorry and comprising a lever beam swingablevertically and horizontally with respect to the lorry, and having longand short arms and a fulcrum portion intermediate the outer ends of thebeam; an hydraulic device for at least partially moving the beam, saiddevice including a vertical pressure cylinder mounted substantially fastwith respect to the lorry; a piston in the cylinder and provided with anupwardly extending rod having an upper end portion; hinge means forconnecting the upper end portion of the rod to the fulcrum portion ofthe beam; an off-set socket member mounted on the upper end of thecylinder for turning about the axis of the cylinder; a generallyvertical draw rod slidably passing through the socket member and havingthe upper end thereof pivotally mounted on the outer end of said shortarm; guide means in the socket member for guiding the rod through thesocket member; means for turning the socket member to carry with it thedraw rod and beam, and means on the socket member and draw rod to limitupward movement of the draw rod through the socket member.

3. A loading device for a lorry and comprising a lever beam swingablevertically and horizontally with respect to the lorry, and having longand short arms and a fulcrum portion intermediate the outer ends of thebeam; an hydraulic device for at least partially moving the beam, saiddevice including a vertical pressure cylinder mounted substantially fastwith respect to the lorry; a piston in the cylinder and provided with anupwardly extending rod having an upper end portion; hinge means forconnecting the upper end portion of the rod to the fulcrum portion ofthe beam; an oiT-set socket member mounted on the upper end of thecylinder for turning about the axis of the cylinder; means for turningthe socket member; a generally vertical draw rod slidably passingthrough the socket member and having the upper end thereof pivotallymounted on the outer end of said short arm; guide means in the socketmember for guiding the rod through the socket member, and means on thesocket member and draw rod to limit upward movement of the draw rodthrough the socket member; said draw rod being generally of T-shapecross section and said guide means being a pair of parallel horizontalrods, one parallel with and engaging the outer face of the flangeforming the cross of the T and the other engaging the edge of the web,said socket member including a pair of vertical plates carrying theparallel rods and engaging on opposite edges of the flange so thatturning of the socket member causes the draw rod to gyrate.

References Cited in the file of this patent UNITED STATES PATENTS2,605,002 Graves July 29, 1952 2,828,867 Frisk Apr. 1, 1958 FOREIGNPATENTS 149,326 Sweden Mar. 22, 1955 OTHER REFERENCES Sundins Germanapplication, Serial No. Hli,823, printed August 2, 1956, Re 35b, Gr 311,3 shts. drawings, 4 pp. specification.

